In two hours, twenty minutes at just under sonic speed, they had covered fourteen hundred miles.

The difficulties surrounding flight at sonic speeds appeared to increase with increasing knowledge.

"Can you control the vehicle as it goes from transonic to sonic speeds?"

The lander cruised five miles up at just under sonic speed.

The shudder eased: the plane had dropped back through sonic speed.

Don't cross sonic speed until we've got lots of room.

The sonic fold won't take more than a few times sonic speed.

He couldn't see it working; they weren't moving at anywhere near sonic speed.

The notion is to have them hit the bees at sonic speeds.

It reached a peak at sonic speed, then cut off sharply.